DEMO MANUAL DC2049A LT3999EMSE Low Noise Isolated Power Supply DESCRIPTION The DC2049A demonstrates how a power supply regulates two output voltage by using the LT®3999 and low dropout (LDO) regulators. The LT3999 is a monolithic push-pull DC/DC driver which features wide input range and small external passive components. The LT3999 has duty circle control for ΔVIN compensation, which allows for a wide input voltage range and low LDO losses. The DC2049A employs a push-pull topology that inherently provides a low-noise solution. The design is well suited to noise sensitive systems such as medical instruments, industrial sensing and control, data conversion and wide band communications. The post regulator LDOs reduce output noise further. For more details about the LDOs, please check the LT3065 and LT3090 data sheets. PERFORMANCE SUMMARY The DC2049A produces an isolated 12VOUT and –12VOUT at up to 200mA each from a 10V ~ 15.5V input voltage range. This board can be modified, by changing the transformer (and duty cycle), to produce other output voltages. The DC2049A features a small transformer, small inductors and capacitors that work at a 1MHz switching frequency. The LT3999 data sheet gives a complete description of the part, operation and applications information. The data sheet must be read in conjunction with this demo manual. The LT3999EMSE is assembled in a 10-lead plastic MSE package with a thermally enhanced ground pad. Proper board layout is essential for maximum thermal performance. See the data sheet section Layout Consideration Check List. Design files for this circuit board are available at http://www.linear.com/demo/DC2049A L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25°C PARAMETERS MIN Input Voltage Range 10.0 TYP MAX UNITS 15.5 VDC Output Voltage 1 (VOUT1) 11.64 12.0 12.3 VDC Output Voltage 2 (VOUT2) –12.36 –12.0 –11.64 VDC Output Current 1 0 200 mA Output Current 2 0 200 mA Switching Frequency Isolation 1.0 MHz 1000 VDC dc2049af 1 DEMO MANUAL DC2049A QUICK START PROCEDURE DC2049A is easy to set up to evaluate the performance of the LT3999EMSE. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: 1. Connect Load 1 (positive) between the VOUT1 and GND terminals and another Load 2 (negative) between the VOUT2 and GND terminals. 2. With power off, connect the input power supply to the +VIN and –VIN terminals. 3. Turn the input power supply on and make sure the voltage is between 10V and 15.5V. 4. To measure the output noise, connect one end of a BNC connector J1. Connect the other end of the BNC cable to an oscilloscope with a 50Ω input impedance. Refer to Application Note 70 for more precise techniques for measuring the output noise. *J1 is the BNC connector to coaxial cable for noise measurement, please refer to AN70 Appendix B for details. Figure 1. Test Procedure Setup Drawing for DC2049A dc2049af 2 DEMO MANUAL DC2049A QUICK START PROCEDURE 70 4 POWER LOSS 3 EFFICIENCY 50 2 40 1 30 IOUT1 = 200mA IOUT2 = 200mA 10 11 12 13 VIN (V) 14 15 16 POWER LOSS (W) EFFICIENCY (%) 60 0 dc2049a F02 Figure 2. Efficiency and Power Loss vs Input Voltage with LT3999 and LDOs Figure 3. Switch Node Voltage, VIN = 10V Figure 4. Switch Node Voltage, VIN = 15V Figure 5. Thermal Image, VIN = 10V, IOUT1 = IOUT2 = 200mA Figure 6. Thermal Image, VIN = 15V, IOUT1 = IOUT2 = 200mA dc2049af 3 DEMO MANUAL DC2049A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 U1 I.C., Push-Pull DC/DC Driver Linear Tech. Corp. LT3999EMSE#PBF 2 1 U2 I.C., Low Noise Linear Reg. Linear Tech. Corp. LT3065EDD#PBF 3 1 U3 I.C., Negative Linear Reg. Linear Tech. Corp. LT3090EDD#PBF 4 4 D1, D2, D3, D4 Schottky Diode 200V/1AMP Central Semi. CMSH1-200HE 5 1 T1 Xfmr. Würth Elektronik 750314781 6 2 L1, L2 Inductor, 39µH Coilcraft XFL3012-393MEC 7 1 C1 Cap., Alum 10µF 50V 10% Sun Elect., 50CE10BSS 8 1 C2 Cap., X5R 4.7µF 25V 20% 0805 Taiyo Yuden TMK212BJ475MG-T 9 2 C3 Cap., X7R 0.1µF 25V 10% 0603 AVX 06033C104KAT2A 10 1 C4 Cap., NPO 180pF 50V 10% 0805 AVX 08055A181KAT2A 11 1 C5 Cap., X7R 4.7µF 25V 20% 1206 TDK C3216X7R1E475M 12 2 C7, C14 Cap., X5R 10µF 50V 20% 1206 TDK C3216X5R1H106M 13 1 C9 Cap., X7R 0.01µF 50V 10% 0603 AVX 06035C103KAT2A 14 2 C10, C16 Cap., X7R 10µF 25V 20% 1206 TDK C3216X7R1E106MT 15 1 C17 Cap., X7R 2200pF 1KV 20% 1206 AVX 1206AC222MAT2A 16 3 R1, R2, R13 Res., Chip 1.00M 0.10W 1% 0603 Vishay CRCW06031M00FKEA 17 1 R4 Res., Chip 143k 0.10W 1% 0603 Vishay CRCW0603143KFKEA 18 1 R5 Res., Chip 86.6k 0.10W 1% 0603 Vishay CRCW060386K6FKEA 19 1 R7 Res., Chip 12.1k 0.10W 1% 0603 Vishay CRCW060312K1FKEA 20 1 R8 Res., Chip 13.3k 0.10W 1% 0603 Vishay CRCW060313K3FKEA 21 1 R9 Res., Chip 49.9k 0.10W 1% 0603 Vishay CRCW060349K9FKEA 22 1 R10 Res., Chip 39Ω 0.125W 5% 0805 Vishay CRCW080539R0JNEA 23 1 R12 Res., Chip 10k 0.50W 5% 1210 Vishay CRCW121010K0JNEA 24 1 R14 Res., Chip 52.3k 0.10W 1% 0603 Vishay CRCW060352K3FKEA 25 1 R16 Res., Chip 10k 0.25W 5% 1206 Vishay CRCW120610K0JNEA 26 1 R17 Res., Chip 243k 0.10W 1% 0603 Vishay CRCW0603243KFKEA Additional Demo Board Circuit Components 1 1 R11 Res/Jumper, Chip 0Ω 0.10W 0603 Vishay CRCW06030000Z0EA 2 2 C12 Cap., X7R 0.1µF 25V 10% 0603 AVX 06033C104KAT2A 3 1 C11 Cap., X5R 1µF 25V 20% 0603 AVX 06033D105MAT2A 4 0 C6, C8, C13, C15 (Opt) Cap., 1206 5 0 R3, R6 (Opt) Res., 0603 6 0 R15 (Opt) Res., 1206 Hardware: For Demo Board Only 1 1 J1 BNC Connector Connex 112404 2 7 E1, E2, E3, E4, E5, E6, E7 Turret, Testpoint Mill Max 2501-2-00-80-00-00-07-0 dc2049af 4 DEMO MANUAL DC2049A SCHEMATIC DIAGRAM dc2049af Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 5 DEMO MANUAL DC2049A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation dc2049af 6 Linear Technology Corporation LT 1014 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2014